Method and device for separating a fibre suspension
AssigneeCelleco Hedemora AB
InventorRoland Fjallstrom
Life of this patent
Estimating the term…
Abstract
A fibre suspension is separated by a filter device having a hollow filter body (1) with a wall (2) of filter material, and a container (3). The entire fibre suspension to be separated is sprayed in the form of at least one liquid jet onto said wall (2) to force a fine fraction of the suspension containing most of said undesired particles through said wall of filter material into the hollow filter body, thereby leaving a created coarse fraction of the fibre suspension mainly containing fibres in the container outside the filter body. Relative displacement between the liquid jet and the filter material is provided. Said created coarse fraction is dewatered through the wall of filter material, and said dewatered coarse fraction is discharged from the container.
Claims9
A method of separating a fibre suspension by means of a filter device having a hollow filter body with a wall of filter material, and a container in which the filter body is arranged, said method comprising spraying fibre suspension against the wall of filter material to force a fine fraction of the fibre suspension through the wall of filter material into the hollow filter body and leave a pool of coarse fraction of the fibre suspension in the container outside the hollow filter body, positioning the hollow filter body in said pool of coarse fraction, dewatering said coarse fraction through said wall of filter material, discharging the dewatered coarse fraction from the container, displacing the wall of filter material alternately up and down through the surface of said pool of coarse fraction, and spraying fibre suspension against the wall of filter material as the latter is displaced above said pool of coarse fraction.
A separator device for separating a fibre suspension, comprising a hollow filter body having a wall of filter material, a container in which the filter body is situated, supply means for furnishing fibre suspension to be separated to the separator device, spray means arranged to spray fibre suspension onto said wall of filter material, means for providing relative displacement between said spray means and said wall of filter material, said supply means being arranged to supply said spray means with the entire fibre suspension to be separated, said spray mans being positioned relative to said hollow filter body to force a fine fraction of the fibre suspension through said wall of filter material into said hollow filter body and leave a pool of a coarse fraction of the fibre suspension in said container outside said hollow filter body, said hollow filter body adapted to being positioned in said pool of coarse fraction to dewater said coarse fraction through said wall of filter material, and means for discharging said dewatered coarse fraction from said container wherein said displacement means being arranged to displace said wall of filter material alternately up and down whereby the filter material is displaced through the surface of said pool of coarse fraction, and said spray mans being arranged to spray fibre suspension onto a part of said wall of filter material which is displaced downwardly by said displacement means.
Dependencies are inferred from the claim text.